Financial Instruments (Schedule Of Changes In Cash Flow Hedges In Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified				12 Months Ended
	Jul. 29, 2012	Jul. 31, 2011	Aug. 01, 2010	Jul. 29, 2012 Foreign Exchange Forward Contracts [Member]	Jul. 31, 2011 Foreign Exchange Forward Contracts [Member]	Jul. 29, 2012 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Jul. 31, 2011 Foreign Exchange Forward Contracts [Member] Cost Of Products Sold [Member]	Jul. 29, 2012 Foreign Exchange Forward Contracts [Member] Other Expenses/Income [Member]	Jul. 31, 2011 Foreign Exchange Forward Contracts [Member] Other Expenses/Income [Member]	Jul. 29, 2012 Interest Rate Swap [Member]	Jul. 31, 2011 Interest Rate Swap [Member]	Jul. 29, 2012 Interest Rate Swap [Member] Interest Expense [Member]	Jul. 31, 2011 Interest Rate Swap [Member] Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
OCI derivative gain/(loss) at beginning of year	$ (16)	$ (31)	$ (28)
Derivative instruments gain (loss) recognized in OCI				13	(12)					2	0
Derivative instrument gain (loss) reclassified						(1)	4	(2)	2			3	3
OCI derivative gain/(loss) at end of year	$ (16)	$ (31)	$ (28)